I recently bought Castlevania Chronicles off of eBay and have really been enjoying that. I've wanted the game for a while, but the price usually stopped me from getting it.
Anyway, it's really a fantastic game. The attention to detail throughout the levels is fantastic, and I'm a big fan of the arranged soundtrack. Some of my favorite moments so far would have to be finding the Bone Dragon's corpse halfway through Stage 2, the entirety of Stage 3, that creepy human "painting" right before you fight Death, the huge painting that looks like you're outside (again, in Death's level right when you come up on the floor his boss fight is on) which then chips and falls down, and I really like the Hall of Mirrors. Fantastic game so far.